package com.zkq.graduate.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * @Author zhangkaiqiang
 * @Date 2019/11/21  8:58
 * @Description 得到客户端请求的地址
 */
public class IpAddressUtil {


	/**
	 * 得到客户端请求的公网IP地址
	 * @param request
	 * @return
	 */
	public static String getPublicAddress(HttpServletRequest request){
		return "";
	}


	/**
	 * 得到客户端请求的内网地址
	 * @param request
	 * @return
	 */
	public static String getPrivateAddress(HttpServletRequest request){
		String ipAddress = request.getHeader("x-forwarded-for");
		// 对于通过多个代理的情况,第一个IP为客户端真实IP,多个IP按照','分割
		if(ipAddress!=null && ipAddress.length()>15){
			if(ipAddress.indexOf(",")>0){
				ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
			}
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("HTTP_CLIENT_IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getHeader("X-Real-IP");
		}
		if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
			ipAddress = request.getRemoteAddr();
			if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){
				//根据网卡取本机配置的IP
				InetAddress inet=null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				ipAddress= inet.getHostAddress();
			}
		}
		return ipAddress;
	}
}
